Electrical contactor with removable arc chute



Nov. 8, N66

C. M. HARRINGTON Filed Sept. 10, 1963 2 Sheets-Sheet 1 v i l IF 'I [1 I] II HTT'Y.

Nov. 8, 1966 c, HARRINGTON 3,284,601

ELECTRICAL CONTACTOR WITH REMOVABLE ARC CHUTE Filed Sept. 10, 1963 2 Sheets-Sheet 2 CARL M. HARRINGTON, BY

United States Patent 3,284,601 ELECTRICAL CONTACTOR WITH REMOVABLE ARC CHUTE Carl M. Harrington, Columbus, Ohio, assignor to Jeffrey Galion Manufacturing Company, a corporation of Ohio Filed Sept. 10, 1963, Ser. No. 307,893 9 Claims. (Cl. 200-144) The instant invention relates to electrical contactors, and more particularly, to an improved and simplified construction for such devices.

It is the prime object of the instant invention to provide an improved and simplified construction of an electrical contactor.

It is a further object of the instant invention to provide an improved electrical contactor, in which the con tactor includes a unitary frame on which the various elements of the contactor are mounted.

It is another object of the instant invention to provide an improved electrical contactor having a relatively small number of parts, whereby the construction of the electrical contactor is simplified.

It is also an object of the instant invention to provide an improved electrical contactor in which the parts of such contactor may be easily removed and replaced, to facilitate maintenance and repair of the device. Yet another object of the instant invention is to provide an improved electrical contactor in which there is provided an integral blowout coil housing, in which there is secured the blowout coil, and which additionally supports a terminal and a contact.

A further object of the instant invention is to provide an improved electrical contactor in which there is an integral arc chute which may be easily secured to and removed from the contactor.

Another object of the instant invention is to provide an improved electrical contactor in which the contacts are easily accessible for removal and replacement.

Still a further object of the instant invention is to provide an improved electrical contactor in which there is an integral arc chute that is supported on the blowout coil housing, and is seated against and releasably secured to the pole pieces of the blowout coil.

It is a further object of the instant invention to provide an improved electrical contactor in which the lead from one contact is led up inside the frame of the contactor to a terminal whereby a major portion of the lead is enclosed within the contactor.

Other objects of the invention will appear hereinafter, the novel features and combinations being set forth in the appended claims.

In the accompanying drawings:

FIG. 1 is a side elevational view of an electrical contactor constructed in accordance with this invention;

FIG. 2 is a front elevational view of the electrical contactor;

FIG. 3 is a sectional view of the electrical contactor, taken on the line 3-3 in FIG. 2;

FIG. 4 is a sectional view through the blowout coil housing, taken on the line 4-4 in FIG. 1;

FIG. 5 is a sectional view through the arc chute, taken on the line 5-5 in FIG. 1;

FIG. 6 is a sectional view through the armature and contact holders, taken on the line 6-6 in FIG. 1;

FIG. 7 is a sectional view through the frame, taken on the line 7-7 in FIG. 1;

FIG. 8 is a side elevational view of the electrical contactor, similar to FIG. 1, and shows the arc chute swung outwardly away from the pole pieces.

Referring to the drawings, there is illustrated therein an electrical contactor 10 constructed in accordance with Patented Nov. 8, 1966 the instant invention. The contactor 10 comprise a frame 11 having a first leg 12 and a second leg 13, which are disposed laterally with respect to each other. As seen in FIGS. 1 and 3, the first leg 12 is laterally disposed, and the second leg 13 is disposed in an upright position. Thus, the first leg 12, in effect, forms the top of the contactor 10, and the second leg 13 forms the back of the contactor 10. A foot 14 is secured to the lower end of the upright second leg 13 by a pair of rivets 15, as seen in FIG. 7. Thus, the foot 14 is permanently and fixedly secured to the upright leg 13, and, in effect, becomes an integral part of the unitary frame 11. The upright second leg 13 has a pair of vertically spaced, threaded bores 16, 17 for the reception of bolts or other fasteners by which the contactor 10 may be secured to a supporting structure. Thus, the frame 11 amounts the contactor 10 on the supporting structure.

Within the unitary frame 11, there is secured an operating coil 18. A cap screw 19 extends through the first leg 12 and is threaded into the core 20 of the operating coil 18 to secure it in depending position on the first leg 12. The operating coil 18 is provided with a pair of like terminals 21 on each side of the operating coil 18, by which electrical leads may be connected to the operating coil 18 for energizing the latter. Connection may be made to either pair of terminals 21 depending on the side of the contactor 10 to which the electrical leads reach the terminals 21. Also, the terminals 21 are available at opposite sides of the contactor 10 for connection to another contactor, when operating the contactors together. The operating coil 18 is included in a control circuit by which the operating coil 18 may be energized or deenergized, for operation of the contactor 10, as needed.

A blowout coil housing 25 is secured to the unitary frame 11 on the forward end of the first leg 12. A plurality of cap screws 26 extend through the first leg 12 and are threaded into internally threaded inserts 24 secured in the blowout coil housing 25 to secure the latter to the unitary frame 11. Within the blowout coil housing 25 there is mounted the blowout coil 27, which is wound from a ribbon of conducting material, with a ribbon of insulating material between the adjacent windings. The blowout coil 27 is wound on a permeable core 28, by which the blowout coil 27 is supported in the blowout coil housing 25, as will be described in greater detail hereinafter.

A ribbon lead 29 is secured to the innermost winding of the blowout coil 27, as by extends upwardly at both sides of the blowout coil'27 and beyond the latter to a first terminal 30. The first terminal 30 includes a laterally extending arm 31, which is received in the blowout coil housing 25. A cap screw 32 extends through the blowout coil housing 25 and is threaded into the lateral arm 31 for securing the terminal 30 to the blowout coil housing 25. The ribbon leads 29 at the opposite sides of the blowout coil 27 are disposed at opposite sides of the lateral arm 31, and are secured thereto, as by brazing, to form a conducting connection from the terminal 30 to the blowout coil 27. The con nector 33 of the first terminal 30 is disposed in front and at the top of the blowout coil housing 25.

The Winding of the blowout coil 27 extends downwardly in a depending leg 34, and thence upwardly and forwardly at an angle to form an arc horn 35. A first contact 36 is secured to the lower portion of the blowout coil housing 25 behind the depending leg 34. A cap screw 37 extends through the depending 'leg 34 and through the contact 36, and is threaded into an internally threaded insert 38 secured in the blowout coil housing 25. The blowout coil housing 25 is preferably formed of plastic material, and accordingly, the internally threaded inserts brazing. The ribbon lead 29 3 24, 38- are anchored in the blowout coil housing 25 by molding the latter around the inserts 2'4, 38. The blowout coil housing 25 is molded as an integral element, that is to say, a one piece construction.

The foot 14 of the unitary frame 11 includes a late-rally extending web 40 in which there is press fitted a spring locking pin 41 that extends downwardly from the web 40, as best seen in FIG. 3. A pivot pin 42 extends laterally through and beyond the opposite sides of the foot 14, as best seen in FIG. 6. The pivot pi 42 has a circumferential notch 43 in which the spring locking pin 41 seats to secure the pivot pin 42 in the foot 14 by preventing movement thereof in an axial direction. A bushing 44 is placed on each projecting end of the pivot pin 42, and an armature 45 is mounted on the bushings 44, whereby the armature 45 is pivotally supported on the foot 14. Each of the bushings 44- has a radial flange 46, which forms a spacer between the foot 14 and the armature 45. A locking set screw 47 is threaded into the web 40 and projects upwardly above the latter to form an adjustable abutment against which the armature 45 rests. The set screw 47 is adjustable by turning it relatively to the web 40, and thereby the spacing between the armature 45 and the core 20 of the operating coil 18 may be adj-usted.

A pivot pin 50 extends laterally through the forward end of the armature 45. A bushing 51 is placed on each end of the pivot pin 50, between the latter and the armature 45. A contact holder 52 is pivotally mounted on the pivot pin 50 between the radial flanges 53 of the bushings 51. The contact holder 52 is formed with a recess 54, as seen in FIG. 3. A spring locking pin 55 is press fitted into the contact holder 52, and extends into the recess 54 to engage the circumferential notch 56 of the pivot pin 50. Thus, the pivot pin 50 is secured to the armature 45 and the contact holder '52, and axial movement of the pivot pin 50 is prevented. A second contact 57 is secured to the front end of the contact holder "52. A cap screw 58 extends through the terminal 59 of lead 60, and thence through the contact 57 and is threaded into the contact holder 52, whereby the contact 57 and the terminal 59 are both secured to the contact holder 52, with an'electrical connection of the terminal 59 to the contact 57. V

The bushings 44, 51 are preferably made of insulating material, so that the armature 45 is insulated from the contact holder 52, and the frame 11 is insulated from the armature 45. The effect of such insulation is to minimize the possibility of these elements forming a conductive path.

An arm 61 extends rearw-ardly from the ntact holder 52. A compression spring 62 is seated between the arm 61 and the web 63 of the armature 4 5. The armature 45 and the contact holder 52 form a linkage by which the second contact 57 is moved into abutting engagement with the first contact 36 to establish an electrical connection. When the operating coil 18 is energized, the armarture 45' is magnetically attracted to the core 20, thereby moving the armature 45 upwardly to the position shown in FIG. 3 in phantom lines. This brings the second contact 57 into engagement with the first contact "36, with a wiping action that assures positive conducting, abutting engagement of the contacts 36, 57. The force of the compression spring 62 is applied through the contact holder 52 to positively press the contact 57 against the contact 36 to assure conducting engagement of the contacts 3'6, 57.

The lead 60 extends below the contact holder 52 and the armature 45 and around the pivot pin 42 and upwardly inside the unitary frame 11 between the second leg 13 and the operating coil 18. An opening 65 is formed in the first leg 12, and the lead 60 extends through the opening 65. A terminal 66 is secured to the end of the lead 60 for connecting the latter to the terminal 67. An arm 68 extends reanwa rdly from the contractor 69 of the terminal 67, and lies on the top of the first leg 12 of the unitary frame 11. A cap screw 70 extends through the terminal 66 and through the arm 68, and is threaded into the leg 12 whereby the terminals 66 and 67 are secured to each other in conducting, abutting engagement, and are also fixedly secured to the top of the unitary frame 11. 4

The first and second contacts 36, 57 are enclosed within an arc chute 7 1 that is formed as an integral element, that is to say, a one piece construction. At the top of the arc chute 71 there is a pivot pin 72, the ends of which project beyond the opposite sides of the arc chute 71. The arc chute 71 is preferably formed of a plastic material, and the pivot pin 7-2 is preferably formed of metal, such as stainless steel, 'so as to be corrosion resisting. The are chute 71 is molded with the pivot pin 72 being inserted in the mold. The pivot pin 72 has a circumferentially undercut portion 73, and the plastic material of the arc chute 71 is molded into this undercut portion 73, whereby the pivot .pin 72 is securely locked in the arc chute 71.

At the front of the blowout coil housing 25 there are provided oppositely disposed notches 74- which open upwardly to receive the ends of the pivot pin 72. The are chute 71 thus is pivotally or swingably mounted on theblowout coil housing 25, whereby it may be swung toward and away from its seated position, in which it encloses the first and second contacts 36, 57, as seen in FIGS. 1 and 3. In swinging the arc chute 71 away from its seated position, as aforesaid, the arc chute 71 is swung outwardly and upwardly in the clockwise direction to the position shown in FIG. 8.

At the opposite sides of the blowout coil housing 25 there are provided pole pieces 75, 7 6, which extend downwardly from the blowout coil housing 25, as best seen in FIG. 1. The pole pieces 75, 7-6 are formed with circular projections 77, 78, which extend into circular openings 79, 80, respectively, that are formed in the opposite sides of the blowout coil housing 25. The circular projections 77, 78 abut the opposite ends of the blowout coil core 28. A cap screw 81 extends through the circular projection 77 of the pole piece and is threaded into the core 28. Similarly, a cap screw 82 extends through the circular projection 78 of the pole piece 76 and is threaded into the other side of the core 28 whereby the pole pieces 75, 76 are secured to the core 28 of the blowout coil 27. The pole pieces 75, 76 are fiat, plate-like elements, except for the circular projections 77, 78. The blowout coil housing 25 is formed with recesses 83, 84 at the opposite sides thereof to receive the pole pieces 75, 76, respectively, whereby the latter are flush with the side faces of the blowout coil housing 25.

The pole pieces 75, 76 extend downwardly from the blowout coil 27 to the region in front of the first and second contacts 36, 57. The blowout coil core 28 and the pole pieces 75, 76 are formed of permeable material, and upon energization of the blowout coil 27 there is established a magnetic field between the opposite ends of the pole pieces 75, 76, which operates to elongate the are that is formed between the first and second contacts 36, 57, and to draw it out along the are born 35 within the arc chute 71, whereby such arc is dissipated.

In its seated position, the arc chute 71 is disposed between the pole pieces 75, 76. The opposite side faces of the arc chute 71 are formed with recesses 85, 86 of substantially the same depth as the thickness of the pole pieces 75, 76. There are thus provided shoulders 87, 88 at the opposite sides of the arc chute 71, which are complementally formed with respect to the respective pole pieces 75, 76, as best seen in FIG. 1. Thus, the arc chute 71 is seated adjacent the pole pieces 75, 76, when it is in position to enclose the contacts 36, 57. The pole pieces 75, 76 are formed with notches 89, 90, respectively, at

their lower ends. The are chute 71 has spring detents 91, 92 secured to the opposite sides thereof and adapted to engage the notches 89, 90, respectively, whereby the arc chute 71 is fixedly secured in its seated position.

The electrical lines, which are adapted to be connected to each other by the contactor 10, are secured to the terminals 30, 67. There is then a connection from the terminal 30 through the blowout coil 27 to the first contact 36. There is a conducting path from the second contact 57 through the terminal 59, the lead 60, the terminal 66 and the terminal 67 to the other electrical line. Upon energization of the operating coil 18 the core 20' is magnetized, and exerts a force on the armature 45, drawing it upwardly and bringing the second contact 57 into abutting engagement with the first contact 36, whereby an electrical connection is established between the lines connected to the terminals 30, 67. Upon deenergization of the operating coil 18, the armature 45 drops away, and the contacts 36, 57 separate, with the arc that is formed between such contacts being elongated and dissipated within the arc chute 71, as above described.

The unitary frame 11, the armature 45, the contact holder 52, and the pole pieces 75, 76 may all be formed of a suitable metal, and may be plastic coated for corrosion resistance. Other elements of the contactor 10, such as the various cap screws that are used in assembling the elements, the pivot pins 42, 50, the spring 62, the set screw 47 and the spring locking pins 41, 55 may be formed of stainless steel, also for the purpose of corrosion resistance. The blowout coil housing 25 and the arc chute 71 are preferably formed of a plastic material, whereby these elements can be readily molded, and each be formed as an integral element. The elements of the contactor 10, which are included in the electrical circuit, are formed of suitable conducting materials in the customary manner.

The plastic coating on the armature 45 forms an air gap between it and the core 20 of the operating coil 18, when the armature 45 is drawn up against the core 20. The provision of such air gap causes the armature 45 to drop away more quickly from the core 20 when the operating coil 18 is deenergized. The flange 46 of each bushing 44 provides an air gap between the armature 45 and the unitary main frame 11 which tends to reduce the effect of residual magnetism in these elements. Such residual magnetism would detrimentally affect the operation of the armature 45 by opposing movement thereof.

It is necessary to remove and replace the contacts 36, 57 at regular intervals, inasmuch as the contacts become worn by the arcing that occurs each time that the contacts 36, 57 are separated. In the contactor constructed in accordance with this invention, the contacts 36, 57 are very easily accessible to facilitate removal and replacement of the same. It is merely necessary to remove the arc chute 71, which is accomplished by releasing the spring detents 91, 92 and swinging the arc chute 71 outwardly on the pivot pin 72. When the arc chute 71 is swung clear of the pole pieces 75, 76, as seen in FIG. 8, the pivot pin 72 may be lifted out of the notches 74 of the blowout coil housing 25. The contact 36 is released by removal of the cap screw 37, the latter being reached through an opening 39 provided in the arc horn 35. The second contact 57 is released by removal of the cap screw 58. Both cap screws 37, 58 are readily accessible when the arc chute 71 is removed from its seated position. The cont-acts 36, 57 are replaced by the reverse procedure. The arc chute 71 is replaced simply by seating the opposite ends of the pivot pin 72 in the opposite notches 72 of the blowout coil housing 25, and swinging the arc chute 71 downwardly until it is seated adjacent the pole pieces 75, 76, with the spring detents 91, 92 in engagement with the notches 89, 90.

The contactor 10 of this invention is constructed in such manner that it utilizes a relatively small number of parts, whereby the construction of the same is simplified. The main element of the contactor 10 is the unitary frame 11, on which the several elements of the contactor 10 are mounted. Thus, the armature 45 and contact holder 52 are supported on the foot 14 of the unitary main frame 11. The operating coil 18 is supported on the leg 12 of the frame 11. The leg 13 of the frame 11 is used for attaching the contactor 10 to a supporting structure.- The blowout coil housing 25 is formed as an integral element, which is secured to the forward end of the first leg 12 of the unitary frame 11, and the arc chute 71, also formed as an integral element, is supported on the blowout coil housing 25. It is thus seen that the contactor 10, constructed in accordance with this invention is a materially simplified structure.

Obviously those skilled in the art may make various changes in the details and arrangement of parts without departing from the spirit and scope of the invention as defined by the claims hereto appended, and applicant therefore wishes not to be restricted to the precise construction herein disclosed.

Having thus described and shown an embodiment of the invention, what it is desired to secure by Letters Patent of the United States is:

1. An electrical contactor comprising a frame on which the several elements of the contactor are supported, said frame having a first leg and a second leg which are laterally directed with respect to each other, an integral blowout coil housing secured to the first leg, a first terminal secured to the blowout coil housing, a blowout coil within the housing connected to said first terminal, a first contact secured to the blowout coil housing and connected to the blowout coil, lever means connected to the second leg, a second contact secured to said lever means to be moved thereby into and out of contact with the first contact, pole pieces secured to said blowout coil and to said blowout coil housing and extending from the blowout coil to adjacent the first and second contacts to elongate the are upon separation of the first and second cont acts, an integral arc chute enclosing said first and second contacts, pin means for swingably supporting the arc chute on the blowout coil housing for swinging the arc chute toward and away from a seated position adjacent and between the pole pieces, a lead connected to the second contact, said lead extending from the second contact around the lever means and up along the second leg adjacent the inner surface thereof to a second terminal, and said second terminal being secured to said frame.

2. An electrical contactor as recited in claim 1 including releasable spring detent means by which the arc chute is releasably secured in seated position against the pole pieces, and said spring detent means being engaged with and released from the pole pieces by swinging the arc chute on said .pin means toward and away from its seated position adjacent the pole pieces, respectively.

3. An electrical contactor comprising first and second contacts adapted to be engaged one with the other and to be separated one from the other to establish and to break an electrical connection, respectively, a blowout coil, pole pieces secured to the blowout coil and extending from the blowout coil to the contacts to elongate the are upon separation of the contacts, said pole pieces being laterally spaced from each other an arc chute enclosing the contacts, a portion of said are chute being c-omplementally formed with respect to the pole pieces for seating the arc chute adjacent and between the pole pieces in position to enclose the contacts and including a portion of the arc chute that is substantially as wide as the lateral spacing of said pole pieces for moving the arc chute into seated position between the pole pieces by sliding movement of the arc chute relative to the pole pieces.

4. An electrical contactor comprising first and second contacts adapted to be engaged one with the other and to be separated one from the other to establish and to break an electrical connection, respectively, a blowout coil, pole pieces secured to the blowout coil and extending from the blowout coil to the contacts to elongate the arc upon separation of the contacts, an arc chute enclosing the conasse sor tacts, a portion of said are chute being complementally formed with respect to the pole pieces for seating the arc chute adjacent and between the pole pieces in position to enclose the contacts and including a portion of the arc chute that is substantially as wide as the lateral spacing of said pole pieces for swinging the arc chute into seated position between the pole pieces by sliding movement of the arc chute relative to the pole pieces, said are chute being pivotally mounted on a fixed part of the contactor to swing the arc chute toward and away from its seated position adjacent and between the pole pieces for attachment and removal of the arc chute, respectively.

5. An electrical contactor comprising first and second contacts adapted to be engaged one with the other and to be separated one from the other to establish and to to break an electrical connection, respectively, a blowout coil, pole pieces secured to the blowout coil and extending from the blowout coil to the contacts to elongate the are upon separation of the contacts, an integral arc chute enclosing the contacts, a portion of said are chute being complementally formed with respect to the pole pieces for seating the arc chute adjacent and between the pole pieces in position to enclose the contacts and including a portion of the arc chute that is substantially as wide as the lateral spacing of said pole pieces for swinging the arc chute into seated position between the pole pieces by sliding movement of the arc chute relative to the pole pieces, pin means for swingably mounting the arc chute on the contactor to swing the arc chute toward and away from its seated position adjacent and between the pole pieces for attachment and removal of the arc chute, respectively.

6. ,An electrical contactor comprising first and second contacts adapted to be engaged one with the other and to be separated one from the other to establish and to break an electrical connection, respectively, an integral blowout coil housings, a blowout coil within said housing, pole pieces extending from the blowout coil to the contacts to elongate the are upon separation of the contacts, an arc chute enclosing the contacts, said are chute being disposed adjacent and between said pole pieces and in engagement with said pole pieces to maintain the arc chute in position to enclose the contacts, said are chute being pivotally mounted on the blowout coil housing to swing the arc chute toward and away from its position in which it encloses the contacts for attachment and removal of the arc chute, respectively, and said are chute being disengaged from said pole pieces when it is swung away from the contacts and from the pole pieces for removing the arc chute.

7. An electrical contactor comprising first and second contacts adapted to be engaged one with the other and to be separated one from the other to establish and to break an electrical connection, respectively, an integral blowout coil housing, a blowout coil within said housing, pole pieces extending from the blowout coil to the contacts to elongate the are upon separation of the contacts, an arc chute enclosing the contacts, said are chute being disposed adjacent and between said pole pieces and in engagement with said pole pieces to maintain the arc chute in position to enclose the contacts, a pin and a notch for removably receiving the pin to swingably mount the arc chute on the blowout coil housing to permit the are chute to be swung toward and away from its position in which it encloses the contacts for attachment and removal of the arc chute, respectively, and said arc chute being 0 disengaged from said pole pieces when it is swung away from the contacts and from the pole pieces for removing the arc chute.

8. An electrical contactor comprising first and second contacts adapted to be engaged one with the other and to be separated one from the other to establish and to break an electrical connection, respectively, an integral blowout coil housing, a terminal secured to said housing, a blowout coil within said housing connected to said terminal, said first contact being secured to said housing and being connected to said blowout coil, pole pieces extending from the blowout coil to the contacts to elongate the are upon separation of the contacts, an arc chute enclosing the contacts, said are chute being disposed adjacent and between said pole pieces and in engagement with said pole pieces to maintain the arc chute in position to enclose the contacts, a pin secured to said arc chute with its ends projecting from opposite sides of the arc chute, said blowout coil housing having notches to removably receive the ends of the pin to swingably mount the arc chute on the blowout coil housing to swing the arc chute toward and away from its position in which itencloses the contacts for attachment and removal of the arc chute, respectively, and said are chute being disengaged from said pole pieces when it is swung away from the contacts and from the pole pieces for removing the arc chute, and releasable spring detent means for securing the arc chute in position enclosing the contacts.

9. An electrical contactor comprising first and second contacts adapted to be engaged one with the other and to be separated one from the other to establish and to break an electrical connection, respectively, an integral blowout coil housing, a blowout coil within said housing, pole pieces secured to the blowout coil and extending from the blowout coil to the contacts to elongate the arc upon separation of the contacts, said pole pieces being laterally spaced from each other, an arc chute enclosing the contacts, a portion of said are chute being complementally formed with respect to the pole pieces for seating the arc chute adjacent and between the pole pieces and in engagement with said pole pieces to maintain the arc chute in position to enclose the contacts, said are chute being pivotally mounted on the blowout coil housing to swing the arc chute toward and away from its seated position adjacent and between the pole pieces in which it encloses the contacts for attachment and removal of the arc chute, respectively, and said are chute being disengaged from said pole pieces when it is swung away from the contacts and the pole pieces for removing the arc chute.

References Cited by the Examiner UNITED STATES PATENTS 934,573 9/ 1909 Sandborgh 200147 1,109,245 9/1914 Murphy 200147 X 1,155,626 10/1915 Steen 200147 1,156,201 10/1915 Barnum 200147 1,649,018 11/1927 Candce 200147 1,724,840 8/1929 Jones et a1. 200147 X 2,337,949 12/ 1943 Walle 200-147 3,177,325 4/1965 Pokorny 200147 X 3,189,716 6/1965 Hugus 200-147 ROBERT K. SCHAEFER, Primary Examiner.

ROBERT S. MACON, Examiner. 

1. AN ELECTRICAL CONTACTOR COMPRISING A FRAME ON WHICH THE SEVERAL ELEMENTS OF THE CONTACTOR ARE SUPPORTED, SAID FRAME HAVING A FIRST LEG AND A SECOND LEG WHICH ARE LATERALLY DIRECTED WITH RESPECT TO EACH OTHER, AN INTEGRAL BLOWOUT COIL HOUSING SECURED TO THE FIRST LEG, A FIRST TERMINAL SECURED TO THE BLOWOUT COIL HOUSING, A BLOWOUT COIL WITHIN THE HOUSING CONNECTED TO SAID FIRST TERMINAL, A FIRST CONTACT SECURED TO THE BLOWOUT COIL HOUSING AND CONNECTED TO THE BLOWOUT COIL, LEVER MEANS CONNECTED TO THE SECOND LEG, A SECOND CONTACT SECURED TO SAID LEVER MEANS TO BE MOVED THEREBY INTO AND OUT OF CONTACT WITH THE FIRST CONTACT, POLE PIECES SECURED TO SAID BLOWOUT COIL AND TO SAID BLOWOUT COIL HOUSING AND EXTENDING FROM THE BLOWOUT COIL TO ADJACENT THE FIRST AND SECOND CONTACTS TO ELONGATE THE ARC UPON SEPARATION OF THE FIRST AND SECOND CONTACTS, AN INTEGRAL ARC CHUTE ENCLOSING SAID FIRST AND SECOND CONTACTS, PIN MEANS FOR SWINGABLY SUPPORTING THE ARC CHUTE ON THE BLOWOUT COIL HOUSING FOR SWINGING THE ARC CHUTE TOWARD AND AWAY FROM A SEATED POSITION ADJACENT AND BETWEEN THE POLE PIECES, A LEAD CONNECTED TO THE SECOND CONTACT, SAID LEAD EXTENDING FROM THE SECOND CONTACT AROUND THE LEVER MEANS AND UP ALONG THE SECOND LEG ADJACENT THE INNER SURFACE THEREOF TO A SECOND TERMINAL, AND SAID SECOND TERMINAL BEING SECURED TO SAID FRAME. 